The exhibition, which includes items from Melanesia, Micronesia, Polynesia and New Zealand, marks 250 years since British explorer James Cook set off aboard the HMS Endeavour for the South Pacific.
Some social media users praised the Duchess for closing the door while others joked she may have cost someone their job.
But it wasn't the absence of her fiery-haired husband at the exhibition that set tongues wagging, but the fact that the Duchess was captured closing her own auto door upon arrival. Good thing she has arms and is able to close the door!
Making her arrival, Meghan is seen getting out of the vehicle having had the door opened for her.
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But one royal correspondent tried to bring everyone back to their senses by noting that Meghan had not, in fact, breached any protocol.
Whether her security is quicker to shut the door for her after this remains to be seen. "It is something she's always done herself like the rest of us".
Despite most people assuming door shutting just wasn't something royals were supposed to do, etiquette and protocol coach William Hanson insisted there were actually no rules in place.
She is also expected to refrain from voting, as a member of the politically-neutral Royal Family.
"I love that she dressed in black so that the kids will really be the stars of the night", wrote one commentator on social media after Meghan and Harry's appearance at the 2018 WellChild Awards earlier this month.